I read a lot about this when it happened, but for brevity, here is the wiki paragraph
In an interview Ariel Schulman related that some viewers believe Catfish to be a fake documentary, or a hoax. Morgan Spurlock, director and subject of the documentary Super Size Me, walked up to the producers of the film during one of its initial screenings and told them "it was the best fake documentary I have ever seen." Comedian Zach Galifianakis also has stated that he does not believe the events in the film to be true.[4]
Kyle Buchanan at Movieline questions why the filmmakers would begin obsessively documenting Nev's online relationship so early on, and argues that it is highly improbable that media-savvy professionals like the Schulmans and Joost would not use the Internet to research Megan and her family before meeting them.[5] Others have also questioned the trio's decision to begin filming, as well as the seemingly improbable coincidence of them catching everything of importance to the story on film as it happens. It has also been pointed out that the group's supposed movements in Catfish are not documented in their public blog postings at the time. [6]
http://en.wikipedia.org/wiki/Catfish_(film)
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